CVE-2026-58127Public exploitNetwork attack vector

Unauthenticated SYSTEM code execution via .NET remoting

Published Jul 1, 2026 · Updated Jul 1, 2026

Unsafe deserialization in Hyland PACSgear Media Writer 5.2.1 allows remote attackers to execute code as SYSTEM through TCP port 9000. PacsgearMediaServerEngine.dll exposes unauthenticated RemoteObj and UIRemoteObj endpoints that unmarshal attacker-controlled MarshalByRefObject calls into WebClient file reads and writes. The endpoints are identical across default installations; code execution requires writing a DLL into the service directory and waiting for or causing a service restart.

CVSS severity9.3
Critical
EPSS probability1.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unsafe deserialization in Hyland PACSgear Media Writer 5.2.1 allows remote attackers to execute code as SYSTEM through TCP port 9000. PacsgearMediaServerEngine.dll exposes unauthenticated RemoteObj and UIRemoteObj endpoints that unmarshal attacker-controlled MarshalByRefObject calls into WebClient file reads and writes. The endpoints are identical across default installations; code execution requires writing a DLL into the service directory and waiting for or causing a service restart.

The record

CVE
CVE-2026-58127
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Hyland
Product
PACSgear Media Writer
Classifications
CWE-306, CWE-502, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hyland · PACSgear Media Writerversion=5.2.1

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo